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Response curves for three different pretreated diamond microelectrodes as a function of the 5-HT concentration. The square wave voltammetric conditions were: increment: 7 mV; frequency: 15 Hz; amplitude: 50 mV. Electrolyte = 0.1 mol L−1 KCl. The electrodes were activated by the combined anodic and cathodic pretreatment.
